The formal garden within the Park is planted with a large variety of indigenous and non indigenous tree species. Conifers within the park include Aleppo Pine (Pinus halepensis), Stone Pine (Pinus pinea), Sandarac gum tree (Tetraclinis articulata), Mediterranean cypress (Cupressus sempervivens), Norfolk Island Pine Araucaria heterophylla (Maltese: Awrikarja) and Smooth Cypress (Cupressus glabra).
The variety of trees planted in the park since the early 1990s are now well established, creating habitats which attract a number of faunal species, the most evident being the birds. One can find several species of birds depending on the season. Resident birds found throughout the year in the park include the Sardinian warbler Sylvia melanocephala(Maltese: Bufula Sewda), Spanish Sparrow Passer hispaniolensis (Maltese: Ghammiel tal-Bejt), Zitting cisticola Cisticola juncidis (Maltese: Bufula tal-Imrewha), and the Collared Dove Streptolia decaocto (Maltese: Gamiema tal-Kullar). During summer the Spotted flycatcher Muscicapa striata (Maltese: Zanzarell tat-Tikki) breeds within the park, while the Short toed lark Calandrella brachydactyla (Maltese : Bilbla) breeds in the open fields surrounding the park.
Visiting Ta’ Qali National Park and the Formal Garden is always a rewarding experience, however in order to maintain the beauty and nature of this place everybody must act in a responsible manner. Trees should be respected and cared for by all people, young and old, and should never be harmed at all costs. Making hammocks or tree climbing are unacceptable vandalism acts. Naked flames and Barbeques are prohibited within the park. Animals should never be handled or harassed. Litter should always be deposited in appropriate waste bins. In abiding with these few rules the park can be enjoyed by everybody now and in the future.